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Issue 9, 2018
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A comparative study of the density of surface states in solid and hollow TiO2 microspheres

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Abstract

As a crucial photoelectric material, TiO2 microspheres have been widely applied as photoanodes in photovoltaic devices owing to their large surface area, suitable pore size and prominent scattering effect. However, surface states in the TiO2 films playing a significant role in the charge transport process are an important factor influencing the photovoltaic performance. Herein, solid and hollow TiO2 microspheres were compared to investigate the influence of the density and distribution of surface states. The density and distribution of surface states, charge recombination process and band edge shifts were investigated. The results showed that the density of surface states of the TiO2 microspheres decreased after recrystallization, leading to a suppressed charge recombination rate. Moreover, owing to the hollow architecture, recrystallized hollow microspheres (rHM) have higher photon utilization. As a result, a photoelectric conversion efficiency of dye-sensitized solar cells based on the rHM up to 10.57% was obtained.

Graphical abstract: A comparative study of the density of surface states in solid and hollow TiO2 microspheres

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Publication details

The article was received on 02 Jul 2018, accepted on 25 Jul 2018 and first published on 26 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QI00633D
Citation: Inorg. Chem. Front., 2018,5, 2284-2290

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    A comparative study of the density of surface states in solid and hollow TiO2 microspheres

    C. Gao, Y. Peng, L. Hu, L. Mo, X. Zhang, T. Hayat, A. Alsaedi and S. Dai, Inorg. Chem. Front., 2018, 5, 2284
    DOI: 10.1039/C8QI00633D

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